I suspect that the freezing was caused by a combination of operator error (tapping and holding the icons instead of using a single tap), a low battery and some poorly formated ebooks.
I haven't had any problems since I deleted some of the troublemakers, gave the 650 a complete charge and modified my impatient tapping behavior. (knock on wood).
I still have two scanned PDF's (both books on Judo by Dr. Moshe Feldenkrais) that open but show only blank pages. I might try to convert them to a different format to see if that helps.
Thanks for all your comments.
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